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Hot Jupiters are asynchronous rotators
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Hot Jupiters are typically assumed to be synchronously rotating, from tidal locking. Their thermally-driven atmospheric winds experience Lorentz drag on the planetary magnetic field anchored at depth. We find that the magnetic torque does not integrate to zero over the entire atmosphere. The resulting angular momentum feedback on the bulk interior can thus drive the planet away from synchronous rotation. Using a toy tidal-ohmic model and atmospheric GCM outputs for HD189733b, HD209458b and Kepler7b, we establish that off-synchronous rotation can be substantial at tidal-ohmic equilibrium for sufficiently hot and/or magnetized hot Jupiters. Potential consequences of asynchronous rotation for hot Jupiter phenomenology motivate follow-up work on the tidal-ohmic scenario with approaches that go beyond our toy model.
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Cited by 1 Pith paper
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The Effects of Kinematic MHD on the Atmospheric Circulation of Eccentric Hot Jupiters
New 3D simulations of the eccentric hot Jupiter TOI-150b show that a locally calculated magnetic drag weakens the equatorial jet and produces inter-orbit variability in high-resolution emission spectra.
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